/Engine/Source/Runtime/Engine/Classes/Components/SkinnedMeshComponent.h
Tests if BoneName is child of (or equal to) ParentBoneName.
true if child (strictly, not same). false otherwise Note - will return false if ChildBoneIndex is the same as ParentBoneIndex ie. must be strictly a child.
bool BoneIsChildOf ( [FName](API\Runtime\Core\UObject\FName) BoneName, [FName](API\Runtime\Core\UObject\FName) ParentBoneName ) const